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Abstract

Disclosed is an aluminum-based amorphous alloy thin film for use as a reflective and protective layer in optical media. The compositions of aluminum-based alloys are Al(x)M(1-x), where M = Ta, Nb, Mo, W, or Zr, and 0.2 =< x =< 0.8. The amorphous alloys are hard and strongly corrosion-resistant.

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United States

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English (United States)

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Reflective Thin Film for Optical Recording Media

Disclosed is
an aluminum-based amorphous alloy thin film
for use as a reflective and protective layer in optical media. The
compositions of aluminum-based alloys are Al(x)M(1-x), where M = Ta,
Nb, Mo, W, or Zr, and 0.2 =< x =< 0.8. The amorphous alloys are
hard and strongly corrosion-resistant.

Fig. 1 shows
the reflectivity of this amorphous alloy film and
that of a standard aluminum film with respect to time at a
temperature of 85 degrees C and 85% humidity.

Fig. 2 shows
a magneto-optical medium using a reflective layer
of this alloy, where 1 is an aluminum-based amorphous layer, 2 is a
silicon nitride layer, 3 is a TbFeCo magnetic layer, and 4 is a
silicon- nitride-enhanced layer on a poly-carbonate substrate 5.
These layers are made by DC magnetron sputtering.

Fig. 3 shows
the read-write characteristics of a
magneto-optical medium with this amorphous alloy reflective layer.

Fig. 4 shows
a comparison of a magneto-optical medium including
this reflective layer and a conventional medium.